Chaplet



I Oct. 17, 1939. H. F. HOHLFELDER 2,176,179

CHAPLET Filed Jan. 19, 1939 5 6 INVENTOR.

HARVEY FTHOHLFELDER Patented Oct. 17, 1939 UNITED STATES wane CHAPLE'I Harvey F. Hohlfelder,

Cleveland Heights,- Ohio,

assignor to The F. Hohlfelder Company, Cle'veland, Ohio, a corporation of Ohio Application January 19, 1939, Serial No. 251,791 I 1 Claim.

This invention relates, as indicated, to improvements in .chaplets.

As is well known, chaplets are employed for the purpose of positioning cores in molds during the pouring of the metal in the casting operation.

In order that a perfectly sound casting may result, it is essential that the chaplet be so formed that it will not trap gases as the molten metal flows around and over the chaplet, which gases would result in voids in the finished casting.

It is a principal object of my invention to provide a chaplet so formed that the possibility of its trapping gases and thus producing voids in the finished casting is reduced to a minimum.

Other objects of my invention will appear as the description proceeds.

To the accomplishment of the foregoing and related ends, said invention, then consists of the elements hereinafter fully described and particularly pointed out in the claim.

The annexed drawing and the' following description set forth in detail certain structure embodying the invention, such disclosed elements constituting, however, but one of various structural forms in which the principle of the invention may be used.

In said annexed drawing:

Fig. 1 is a side elevational view, partially in section, of a single-headed chaplet made in accordance with the principles of my invention; Fig. 2 is a sectional View of a double-headed chaplet embodying the principles of my invention; Fig. 3 is a transverse sectional view of the chaplet illustrated in Fig. 2 taken on a plane substanstantially indicated by the line 3-3; Fig. 4 is a fragmentary sectional view of a chaplet showing a further embodiment of the principles of my invention; Fig. 5 is a somewhat diagrammatic representation of a casting including a chaplet made in accordance with the practices of the prior art and Fig. 6 is a view similar to Fig. 5 showing the casting embodying a chaplet in accordance with my improved design.

Referring now more particularly to the drawing and more especially to Fig. l, the chaplet here illustrated as one embodiment of my invention comprises a stem l and a head 2 rigidly secured to the stem. The stem is shown as broken, since various lengths of stems are employed in chaplets of this character.

The stem l and head 2 are joined by means of an extension 5 of the stem passing through an opening provided therefor in the head 2 with such projection peened over to rigidly secure the head to the stem.

Instead of joining the head and stem in the manner above explained and as indicated in the drawing, it is within the contemplation of my invention to join such head and stem by any other conventional means, such as arc welding, spot welding, resistance welding, etc. and for certain sizes and types of chap-lets, it will be observed that the head may be formed by upsetting the terminal portion of the stem, in which case, the head and stem will be integral.

At the juncture between the stem l and head 2, I provide a substantial fillet G which may be conveniently formed by upsetting the stem I and which, when the chaplet is in use, is effective to prevent gases being trapped in the juncture between the stem and head.

In the circumferential area of the head 2, immediately adjacent the fillet 6, I provide a plurality of circumferentially spaced openings or vents l which are effective to permit the escape of any gas which would normally be trapped under the head 2.

The chaplet illustrated in Fig. 2 differs from the structure illustrated in Fig. 1 primarily in that the chaplet of Fig. 2 is a double-headed chaplet, i. e., a head such as 2 of Fig. 1 is provided on each end of a stem 8. Similar reference characters will, therefore, be employed in the designation of the essential parts of Fig. 2 which correspond to those of Fig. 1.

The heads of either of the chaplets illustrated in Figs. 1 and 2 may be further modified in order to insure escape of gas and the prevention of voids or blow-holes in the finished casting around the chaplet by rounding the peripheral edge 9 of the head in the manner illustrated in Fig. 4.

By having reference to Fig. 5 the defects in and undesirable characteristics of the prior art chaplets will be apparent. As molten metal filling the mold flows around the chaplet, there is a tendency for gas pockets. to form at H), II, I2 and I3. I have discovered, as a result of very {careful analysis of a number of castings, that such gas pockets are formed for the reason that the gas tends to collect at sharp corners such as the juncture between the stem and head and also at the peripheral edge of the chaplet head. A certain amount of this gas collection can be avoided by the provision of the fillet 5 in the structures illustrated in Figs. 1 to 4 herein and 50 a rounding of the peripheral edge as at 9 in Fig. 4.

I have also discovered that by perforating the head in the area immediately adjacent the fillet,

i. e., as close as possible to the stem of the chaplet, any gas which may be trapped or which may col- 55 lect on the stem and under face of the head of the chaplet will be vented into the sand and thus not trapped and produce voids and blowholes. The illustration given in Fig. 6 indicates, generally, the manner in which the metal flows in and around all of the portions of the chaplet comprising my invention and while in both Figs. 5 and 6 sharp lines delineate the juncture between the cast metal and the metal of the chaplet, it will be observed that in actual castings, no such sharp line will appear, due to a fusion of the chaplet in the casting. The sharp lines, however, have been employed in Figs. 5 and 6 merely for the purpose of facilitating illustration.

Other forms may be employed embodying the features of my invention instead of the one here explained, change being made in the form or construction, provided the elements stated by the following claim or the equivalent of such stated elements be employed.

I, therefore, particularly point out and distinctly claim as my invention:

In a chaplet comprising a stern and a substantially fiat head rigidly secured thereto, an outwardly concave fillet in the juncture between the stem and head whereby the trapping of gases at such juncture is prevented during the flow of molten metal around the chaplet and a plurality of spaced openings through the head in an annular area immediately adjacent the termination of said fillet to permit the escape of gases through said head in the area adjacent the stem.

HARVEY F. HOHLFELDER. 

